Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fce34a74b66f06b…

MALICIOUS

PDF

52.5 KB Created: 2020-06-07 20:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 093d5166dad88ddd474dec2e4e7f0a55 SHA-1: 29a0f3045f5053cd2658244bc8675686abce8be7 SHA-256: 2fce34a74b66f06bef6bed9dd0178fb3587a231999007328b1f4db12c06403f5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which point to seemingly random PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing lure. The ML classifier strongly flagged this PDF as malicious. The document body text, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf and includes a URL that appears to be a bibliography, likely a pretext to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://6gugp.brdge.org/uploads/1/3/0/5/130551055/130551055.html#idalberto+chiavenato+introducci%25C3%25B3n+a+la+teor%25C3%25ADa+general+de+la+administraci%25C3%25B3n+bibliografia
    • http://offalyit.com/uploads/1/3/1/6/131636832/3771011.pdf
    • http://74-123-72-219.mgwnet.com/uploads/1/3/0/6/130639412/vuban_zanifefusu.pdf
    • http://webdisk.theartistsgallery.org/uploads/1/3/0/4/130483320/wovebururojup_lujagamumis_javasuwagefejaf.pdf
    • http://alitiumweltservice.de/uploads/1/3/0/4/130488227/sudip-seponune-zeresiguj-fugebuxujo.pdf
    • http://yasminevintage.com/uploads/1/3/0/4/130476204/448230.pdf
    • http://gvahamiltonpix.greenvalleyag.com/uploads/1/3/0/8/130873902/gupowapinajudekekat.pdf
    • http://dreamlineconstruction.net/uploads/1/3/0/4/130483109/miwelatuxubazav.pdf
    • http://thatbubbleboy.com/uploads/1/3/0/7/130775527/xibezavogukewag-rigasafejilukub-riwiga.pdf
    • http://trimanity.com/uploads/1/3/0/9/130969751/8624773.pdf
    • https://pobukurimu.files.wordpress.com/2020/06/87890944471.pdf
    • https://zuvekaxusuvi.files.wordpress.com/2020/06/8752152113.pdf
    • https://lugopago.files.wordpress.com/2020/06/25463120237.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009829.bin
5836ab672dc4cd3849b542c5e4b8c85152f9cb798cdbab847f1c30f016ce0d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9829 12980 bytes

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